J/ApJ/732/121 V-band and Hβ monitoring of Z299-15 (Barth+, 2011)
Broad-line reverberation in the Kepler-field Seyfert galaxy Zw 229-015.
Barth A.J., Nguyen M.L., Malkan M.A., Filippenko A.V., Li W., Gorjian V.,
Joner M.D., Bennert V.N., Botyanszki J., Cenko S.B., Childress M., Choi J.,
Comerford J.M., Cucciara A., da Silva R., Duchene G., Fumagalli M.,
Ganeshalingam M., Gates E.L., Gerke B.F., Griffith C.V., Harris C.,
Hintz E.G., Hsiao E., Kandrashoff M.T., Keel W.C., Kirkman D.,
Kleiser I.K.W., Laney C.D., Lee J., Lopez L., Lowe T.B., Moody J.W.,
Morton A., Nierenberg A.M., Nugent P., Pancoast A., Rex J., Rich R.M.,
Silverman J.M., Smith G.H., Sonnenfeld A., Suzuki N., Tytler D.,
Walsh J.L., Woo J.-H., Yang Y., Zeisse C.
<Astrophys. J., 732, 121 (2011)>
=2011ApJ...732..121B 2011ApJ...732..121B
ADC_Keywords: Active gal. nuclei ; Photometry ; Spectroscopy ; Line Profiles
Keywords: galaxies: active - galaxies: individual (Zw 229-015) -
galaxies: nuclei
Abstract:
The Seyfert 1 galaxy Zw 229-015 is among the brightest active galaxies
being monitored by the Kepler mission. In order to determine the black
hole mass in Zw 229-015 from Hβ reverberation mapping, we have
carried out nightly observations with the Kast Spectrograph at the
Lick 3m telescope during the dark runs from 2010 June through
December, obtaining 54 spectroscopic observations in total. We have
also obtained nightly V-band imaging with the Katzman Automatic
Imaging Telescope at Lick Observatory and with the 0.9m telescope at
the Brigham Young University West Mountain Observatory over the same
period. We detect strong variability in the source, which exhibited
more than a factor of two change in broad Hβ flux. From
cross-correlation measurements, we find that the Hβ light curve
has a rest-frame lag of 3.86+0.69-0.90 days with respect to the
V-band continuum variations. We also measure reverberation lags for
Hα and Hγ and find an upper limit to the Hδ lag.
Combining the Hβ lag measurement with a broad Hβ width of
σline=1590±47km/s measured from the rms variability
spectrum, we obtain a virial estimate of
MBH=1.00+0.19-0.24x107M☉ for the black hole in
Zw 229-015.
Description:
We obtained V-band photometry of Zw 229-015 following the same
strategy used in recent reverberation programs (e.g., Walsh et al.
2009, Cat. J/ApJS/185/156; Denney et al. 2010ApJ...721..715D 2010ApJ...721..715D).
We obtained regularly scheduled V-band imaging at the 0.76m Katzman
Automatic Imaging Telescope (KAIT) at Lick Observatory, and at the
0.9m telescope at the Brigham Young University West Mountain
Observatory (WMO). We also obtained a small number of images at other
facilities (the Lick 1m Nickel Telescope and the Maidanak Observatory
1.5m telescope).
The spectroscopic monitoring program at the Lick 3m Shane telescope
was carried out by several independent observing teams using the Kast
spectrograph at Lick during Summer and Fall 2010, during 54 nights
(see table 3).
Objects:
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RA (2000) DE Designation(s)
---------------------------------------------------------------
19 05 25.93 +42 27 39.8 Z 229-015 = 2MASX J19052592+4227398
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 24 190 Photometric observations and measurements
table3.dat 71 54 Spectroscopic observations and measurements
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
J/A+A/537/A99 : Large Quasar Astrometric Catalogue 2 (LQAC-2) (Souchay+, 2012)
J/ApJS/185/156 : The Lick AGN monitoring project (Walsh+, 2009)
J/A+A/378/30 : ROSAT-BSC galaxy identifications (Zimmermann+, 2001)
J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.4 d HJD [5351.97/5543.56] Heliocentric Julian Date
(HJD-2450000)
11 A1 --- Tel [KMNW] Telescope used (1)
13- 18 F6.3 mag Vmag [15.957/16.187] The V band magnitude
20- 24 F5.3 mag e_Vmag [0.003/0.02] Uncertainty in Vmag
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Note (1): Telescope as follows:
K = Katzman Automatic Imaging Telescope (KAIT);
W = Brigham Young University West Mountain Observatory (WMO);
N = Lick Observatory's Nickel telescope;
M = Maidanak Observatory.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 "YYYY/MM/DD" Date UT date of the observation
12- 19 F8.3 d HJD [5335.99/5544.63] Heliocentric Julian Date
(HJD-2450000)
21- 23 F3.1 arcsec FWHM [1.1/3.9] Image Full-Width at Half-Maximum (1)
25- 26 I2 --- S/N Signal to Noise (2)
28- 33 F6.2 aW/m2 FHa ? Integrated Hα flux (3)
35- 38 F4.2 aW/m2 e_FHa ? Uncertainty in FHa
40- 44 F5.2 aW/m2 FHb [16.67/44.69] Integrated Hβ flux (3)
46- 49 F4.2 aW/m2 e_FHb Uncertainty in FHb
51- 55 F5.2 aW/m2 FHg Integrated Hγ flux (3)
57- 60 F4.2 aW/m2 e_FHg Uncertainty in FHg
62- 66 F5.2 aW/m2 FHd Integrated Hδ flux (3)
68- 71 F4.2 aW/m2 e_FHd Uncertainty in FHd
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Note (1): The listed FWHM image quality is measured from the spatial profile
of the bright star that fell on the spectrograph slit in each
observation.
Note (2): per pixel in the reduced blue-side spectrum at λ=4700Å.
Note (3): In units of 10-15erg/s/cm2. Measured fluxes include the
contribution of blended narrow-line components.
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 05-Nov-2012